This looks like a nice little guide to carb settings etc. The blurb on the web site (Jenks' Bolts) says:
1. Looks at how the CVK carburettor works and how the various jets and needle interact,
2. Examines the tuning changes that can be made to the various parts of the motor, and
3. Bring all the information together with a clear explanation of the changes you can make and what to expect.
Available to download in pdf format free of charge from here:
http://www.triumph-bonneville.com/images/TN4.pdf
